yea i have verified that ecu does not store all info, when you hook up ski to BUDS it reads MPEM.... which this bus bar was the only thing i could find a memory type in the ski.... when you load another ECU into your ski, the VIN is not the ecu's so it is reading something somewhere else....

The system is a two part unit. One is the ECU, and the other is the disply.

The black things are just jumper links for the bus.

The system works on a protocol known as CAN-BUS.

This is one of the ways modern automotive systems communicate with sensors etc to gather the information for the ECU to make a decision based upon readings.

The 2 part bit is interesting, but in short, what happens is the ECU talks via CAN-BUS to the display unit.
The display unit holds things like Hours etc, and the ECU matches them together.

If you connect a replacement ECU to the display, the first thing it discovers is there is a mis-match on data on one, compared with the other. BUDS sees this, and asks as first operation if the technician would like to sycronise them.

It is not mandatory you do I hasten to add. It (Ski) 'generally' will run wothout sycronisation.

The HIN, engine serial number and owner plus all the variable items are held/stored in both parts of the system.

The best way to see this is a brain in 2 places/parts.

The BUS is the link between cables from one to another, and inter-connected at this point.

There is no MPEM on the new system as such. The MPEM is the older way it was done. Unlike the MPEM for example, the ECU and Display do not have the Regulator/Rectifier in the same box.

The MPEM was a way to centralise all delicate components and operations which were susceptable to the environment, and make the item a one-stop cure/resolution to problems for the technician.